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Check this out, one time I emailed the NHTSA about HIDs and here's what they said:
Dear Mr. Hughes,
HID conversions have always been illegal for sale and installation. In fact, it is very likely that the headlamps that you fitted to the Civic that are not the OEM design, were also illegal to be sold because they probably to not comply with federal headlighting regulations. These regulations do not apply to vehicle owners, however, most states have similar laws that do apply to vehicle owners and drivers.
The problem with HID conversions is that most of them use an HID bulb in place of a Halogen bulb. Even if the arc is placed in exactly the correct location where the filament had been placed, the best result is a tripling of intensity everywhere in the beam. This means not only on the road, but also in the eyes of oncoming and preceding drivers. Done poorly, the glare to other drivers can be 10 or more times as intense.
Regarding aiming, presuming that what you did was to install a once complying OEM HID headlamp into your Civic, aiming should be fairly straight forward. The OEM headlamp should have had the letters "VOL" or "VOR" on the lens. That is to tell you that the lower beam is to be visually/optically aimed using the left side (VOL) of the beam pattern, or the right side (VOR). If it is a VOL lamp, then the cutoff on the left should be aligned to be 53 mm (2 inches) below the center of the lamp, when the vehicle is on a level surface and placed 7.62 meters (25 feet) from a vertical wall, and the beam is projected on that wall. If the lamp is a VOR, then the cutoff on the right side of the beam should be aligned to be the same height as the center of the lamp.